Photographer: Rüdiger Franz (submitted by Ulrich Zielke)
Location: Lulliavagge, altitude: 1,300 m, Sarek National Park, Sweden
Weathered boulder of unknown type (probably amphibolite, gabbro or peridotite) including an astounding intensely folded mafic dike. The dike is surrounded by a pale brown alteration halo, which branch into the rock along some fractures. The boulders shown in the photograph are part of huge masses of debris deposited by glaciers.
(Don’t hessitate to add any suggestions and further information about this rock in the comments section.)´╗┐